I've had the good fortune to see UP's two other operating steam locomotives...Northern #844 and Challenger #3985...under steam and on the rails. They are awesome sights, even for someone like me who, as a kid in Chicago, regularly saw steam locomotives. Nothing, however, compares to the Big Boy. They were UP's largest steam locomotives, and I'm excited to think a Big Boy may run again in my lifetime.
Cheyenne is less than two hours' drive from Denver. I should think it possible for a bunch of AMC Eagles to meet the Big Boy when it arrives in Cheyenne.